Whats wrong with my car? its a 2004 chrystler crossfire since its been cold the only light that comes on is the tire pressure light but now it wont turn over everything works but it will not crank all the way up

the time when you check the tire pressure is before driving it or after is been driven? Reason I am asking this is because the air pressure after use checked would be different from cold start test. as the air after friction expanded and surely is more than the cold.check the tire pressure when cold and see if you are in the limit. If you are and still have the light come on then the problem you have possible are the tire valve sensor. Ask your dealer to check it .

tire rest light? the tire pressure light may come on, but should go out when all tires have the correct pressure. the pressure listed on the drivers door, NOT the pressure on the tire.

try here:

http://www.scribd.com/doc/34216111/2004-Chrysler-Crossfire-Owners-Manual

Take it to the dealer, you may have a bad gauge in the tire. I had the same problem and they finally fixed it.

They are set to put the light on at a certain pressure. In the cold you can loose one pound for every 10 degree temp lose. Since the tires are new, go back were you got them installed and ask them to check if they damaged the sensors!

It should say the tire pressure specs on the side wall of the tire even if they are aftermarket

Check starter motor wires are connected and clean and tight.check the very thin wire at the starter is clean and tight.ALL WIRES ARE ON THE SOLINOID.

These tire pressure monitors are very finiky devices, but the tire pressure does drop cold, it can be a little or a lot depending on the how cold, doesn' the owners manual explain this? If you feel your local dealer does no know what to do to properly address the issue I am providing a link from the owners manual and in it is the contact info for Ford directly.

In the United States:
Ford Motor Company
Customer Relationship Center
P.O. Box 6248
Dearborn, MI 48121
1-800-521-4140
(TDD for the hearing impaired: 1-800-232-5952)
www.customersaskford.com

That sounds like the low tire pressure light. The lights and what they mean can be found in the owners manual. If you do not have one, you can google search and find it online.

your tire pressure is low do to weather change . ie between summer and fall/ in colder weather you need more air in your tires.